GNU C Library master sources branch master updated. glibc-2.20-122-ge80514b

[wilco at sourceware dot org]

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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=e80514b5a87c86a92352ce526c4b9db85f2a242c

commit e80514b5a87c86a92352ce526c4b9db85f2a242c
Author: Wilco Dijkstra <wdijkstr@arm.com>
Date:   Fri Oct 24 16:12:12 2014 +0000

    This patch improves strncat performance by using strlen. Strlen has a fast C implementation, so
    this
    will improve performance even on targets which don't have an optimized strlen. It is about twice
    as
    fast as the original strncat in bench-strncat.

diff --git a/ChangeLog b/ChangeLog
index f73c55e..40e294b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2014-10-24  Wilco Dijkstra  <wdijkstr@arm.com>
 
+	* string/strncat.c (strncat): Improve performance by using strlen.
+
+2014-10-24  Wilco Dijkstra  <wdijkstr@arm.com>
+
 	* string/strcat.c (strcat): Improve performance by using strlen/strcpy.
 
 2014-10-24  Wilco Dijkstra  <wdijkstr@arm.com>
diff --git a/string/strncat.c b/string/strncat.c
index 7ac4456..6d29114 100644
--- a/string/strncat.c
+++ b/string/strncat.c
@@ -33,13 +33,11 @@ STRNCAT (char *s1, const char *s2, size_t n)
   char *s = s1;
 
   /* Find the end of S1.  */
-  do
-    c = *s1++;
-  while (c != '\0');
+  s1 += strlen (s1);
 
   /* Make S1 point before next character, so we can increment
      it while memory is read (wins on pipelined cpus).  */
-  s1 -= 2;
+  s1 -= 1;
 
   if (n >= 4)
     {

http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=6e46de42fe1695818a410a7b86d26be8b1527524

commit 6e46de42fe1695818a410a7b86d26be8b1527524
Author: Wilco Dijkstra <wdijkstr@arm.com>
Date:   Fri Oct 24 16:08:42 2014 +0000

    This patch improves strcat performance by using strlen and strcpy. Strlen has a fast C
    implementation, so this improves performance even on targets which don't have an optimized
    strlen and strcpy - it is 25% faster in bench-strcat. On targets which don't provide an
    optimized strcat but which do have an optimized strlen and strcpy, performance gain is > 2x.

diff --git a/ChangeLog b/ChangeLog
index 98548cb..f73c55e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2014-10-24  Wilco Dijkstra  <wdijkstr@arm.com>
 
+	* string/strcat.c (strcat): Improve performance by using strlen/strcpy.
+
+2014-10-24  Wilco Dijkstra  <wdijkstr@arm.com>
+
 	* sysdeps/aarch64/fpu/fgetexcptflg.c (fegetexceptflag):
 	Call libc_fetestexcept_aarch64.
 
diff --git a/string/strcat.c b/string/strcat.c
index 2cbe8b3..983d115 100644
--- a/string/strcat.c
+++ b/string/strcat.c
@@ -23,26 +23,7 @@
 char *
 strcat (char *dest, const char *src)
 {
-  char *s1 = dest;
-  const char *s2 = src;
-  char c;
-
-  /* Find the end of the string.  */
-  do
-    c = *s1++;
-  while (c != '\0');
-
-  /* Make S1 point before the next character, so we can increment
-     it while memory is read (wins on pipelined cpus).  */
-  s1 -= 2;
-
-  do
-    {
-      c = *s2++;
-      *++s1 = c;
-    }
-  while (c != '\0');
-
+  strcpy (dest + strlen (dest), src);
   return dest;
 }
 libc_hidden_builtin_def (strcat)

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog        |    8 ++++++++
 string/strcat.c  |   21 +--------------------
 string/strncat.c |    6 ++----
 3 files changed, 11 insertions(+), 24 deletions(-)


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